Fluid - Differential: Service and Repair

Lubricant Change





1. Raise and support the vehicle.
2. Place a drain pan or suitable container under the rear axle housing.
3. Remove the rear axle housing oil level fill plug (1) from the rear axle housing.
4. Remove the rear axle housing drain plug (4) from the rear axle housing and drain the rear axle housing.

Notice: Refer to Fastener Notice in Service Precautions.

5. After the rear axle housing has completely drained, install the rear axle housing drain plug (4) into the rear axle housing.
^ Tighten the rear axle housing oil level filler plug to 27 Nm (120 ft. lbs.).
6. Refill the rear axle housing with approximately 1.0 liter (1.0 qt) of Synthetic Gear Oil 75W-140 GM P/N 89021809.
7. Using a graduated measuring cup, add 25 ml (1.0 oz) of Limited Slip Differential Friction Modifier GM P/N 89021958 to the rear axle housing.
8. Fill the rear axle housing with the remaining 0.575 liter (0.644 qt) of Synthetic Gear Oil 75W-140 GM P/N 39021809. The oil level should be even with the bottom of the rear axle housing oil level filler plug hole.
9. Install the rear axle housing oil level fill plug (1) with a new gasket and the lubricant tag (2) into the rear axle housing.
^ Tighten the rear axle housing oil level fill plug to 27 Nm (20 ft. lbs.).
10. Remove the drain pan from under the rear axle housing.
11. Lower the vehicle.